A Cisco Aironet 1020 controller-based access point has been connected to a Catalyst 3550-24 PWRSwitch. However， when it is powered up， the access point fails. What has caused this problem？（）
- Aaccess point does not support 802.11h
- Bincorrect switch power supply
- Cswitch port is not enabled
- Dswitch does not support 802.3af
- Eaccess point has not been initialized with the primary controller